This article is a brief survey of topics of mutual interest in hydrology and meteorology intended primarily for the members of these two professions whose special interests are somewhat removed from the common ground. The last decade has seen substantial progress in our understanding of the water balance and in our ability to put this knowledge to use. A rapidly expanding world population with a correspondingly rapid increase in water requirements for human, industrial, and agricultural uses during the next few decades will require still further efforts to increase our knowledge and develop solutions to new water problems.

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